模式方法模式实例数据库访问

采用模板方法模式实现数据库访问的例子

DataObject.java

package 模板方法;

public abstract class DataObject {
    protected abstract void startConnection();
    protected abstract void endConnect();
    public void templateMethod() {
        this.startConnection();
        this.endConnect();
    }
}

CustomerDataObject

package 模板方法;

public class CustomerDataObject extends DataObject {
     @Override
        protected void startConnection() {
            System.out.println("已连接数据库");
        }
     
        @Override
        protected void endConnect() {
            System.out.println("已关闭数据库");
        }
}

Client

package 模板方法;

public class Client {

    public static void main(String[] args) {
        DataObject user=new CustomerDataObject();
        user.templateMethod();

    }

}